CAIE IGCSE Biology 14.1.8 Structure of a synapse

Practise labelling synapse diagrams and linking vesicles, neurotransmitter, the synaptic gap and receptors to impulse transfer.

Exam points

label vesicles, neurotransmitter, receptors and the synaptic gap on synapse diagrams
distinguish where vesicles are found from where receptor proteins are located
apply toxin or drug evidence to receptor blocking and reduced muscle contraction

[Maximum number: 2]

Fig. 3.1 is a diagram of the junction between two neurones in a healthy person.
Fig. 3.2 is a diagram of the junction between the same two neurones in a person who has Parkinson's disease. This disease affects the nervous system.

Fig. 3.1

Fig. 3.2

Identify the parts labelled X and Y in Fig. 3.2.

X Y

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14.1.8—Structure of a synapse question 1